The microstructure, phase constitution, and physical properties of mullite bodies prepared from α-Al2O3- kaolin mixtures with added B2O3 were investigated. Densification was found to be enhanced with small additions of B2O3. The results indicate that 0.5 wt-% B2O3 increases the content and growth rate of the mullite. It was found to be the optimum addition with respect to densification and resulting properties.
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